{% macro gen_sidebar() %}
    <!-- Left side column. contains the logo and sidebar -->
    <aside class="main-sidebar">
      <!-- sidebar: style can be found in sidebar.less -->
      <section class="sidebar">
        <!-- sidebar menu: : style can be found in sidebar.less -->
        <ul class="sidebar-menu" data-widget="tree">
        </ul>
      </section>
    </aside>
{% endmacro %}
